Randomdata wiki - User contributions [en-gb]

Projects

2025-08-20T11:16:18Z

M10: /* Randomdata Projects - 2025 */ added bus displays project

== Randomdata Projects - 2025 ==

*[[The Mechanical Turk]]
* [[Meshtastic]]
* [[Randomdata chatbot]]
* [[Bus Displays]]

== Randomdata Projects - legacy==
*[[0xchristmas]]
*[[0xc0ffee controler]]
*[[Arduino]]
*[[Adruino_14_segment_LED_board]]
*[[bArduino]]
*[[Beerduino]]
*[[Bio Sensors]]
*[[Digital Testament]]
*[[DYHAMD]]
*[[ESP8266]]
*[[ESP32]]
*[[Fish_Lamp]]
*[[Fumefilter]]
*[[Gemknight]]
*[[GSMdecryption]]
*[[Helios]]
*[[HITR2NDB]]
*[[LedClock]]
*[[Micro brother]]
*[[Mendel90]]
*[[Multitouch]]
*[[Napkinholder]]
*[[RaDD]] RandomData Drone
*[[RandomKey]]
*[[RCstats]]
*[[Secnerve]]
*[[Spacebot]]
*[[Space-Network]]
*[[RIPE aTTYlas]]
*[[RunboData UHF transmitter]]
*[[RDSSPS]] RandomData Self Supporting Power System
*[[Virtual computing space]]
*[[Wallboard 2.0]]

==Reverse enginering==
*[[Reverse engineering ZIOVA CS615]]
*[[Reverse engineering ELRO HA51 wireless]]
*[[Reverse engineering ELRO Flamingo HA31 wireless alarm]]
*[[Reverse engineering ELRO DB280 Doorbel]]
*[[ViVOpay 3000]]
*[[Wallboard]]

== DIY Projects ==
*[[Great poormans_condenser microphone]]
*Getting the 3g module [[HP_un2400]] (Qualcomm Gobi) to work with Win7 and Linux
*Opening up the [[Kreatel]] 1760 IPTV settop box
*Build a nice lamp called '[[Sfeer]]'

==Other==
*[[Samenkopen]] for buying stuff together
*[[BuyersGuide]] describes experiences with buying stuff and possible associated costs

==Just a list of idea's we want to work on==
''please help us by adding idea's to this list''

*Hackers movie night (once a month?)
*Wireless hacking:
**Tweaking AP's
**DIY antenna's
**RFID
*WEBby
**Is your site safe? (&howto test)
**What is that cool thing you do on your site?
**Self defending websites (make an POC)
*Hardware hacking
**Use that soldering iron!
**Digital stuff
**[[Arduino]]
**Homeautomation
*Darknet

== Randomdata retired Projects==
*[[ANTOR]]
*[[KiteCam]]
*[[LED board]]
*[[NSLU2]]

Bus Displays

2025-08-20T11:15:35Z

M10: init bus display page

In august 2025 we acquired bus displays that were used on the Utrecht public transport.

One set consists of a controller, a small display for the line number, and two big displays
that sit in the front and the side of the bus which display line number and destination text.

more info to follow...

Meshtastic

2025-06-07T10:31:52Z

M10: goal build environment

Meshtastic is an open-source project that enables long-range, off-grid communication using affordable LoRa radios. Whether you're hiking in remote areas, preparing for emergencies, or building mesh networks for community or event use, Meshtastic provides a powerful, flexible solution without relying on cellular networks or the internet.

=== Goals ===

* Create coverage within Utrecht
* Create structure within our area
* Create our own hardware etc
* Create a build environment that is welcoming for new hardware and avoids bigTech tools

=== Inital settings ===

* EU868 - Longrange - fast
* Number of HOPS: 4
* Crypto? @TBD

=== Supporting nodes and specs ===

* Randomdata space - HELTEC LoRa 32 V3 - https://www.openstreetmap.org/#map=19/52.076054/5.106660
* Nieuwegein Galecop - HELTEC LoRa 32 V3 - https://www.openstreetmap.org/#map=19/52.053537/5.081138

Main Page

2025-03-30T15:43:47Z

M10: typos fixed

__NOTOC__
=Welcome to Randomdata=
This wiki has been created for the members of Randomdata to leave information, start-up & maintain projects, random spam, etc. It's an old restore so check the date of the pages. 
Feel free to leave, create, modify, etc any page. This is a wiki! :D

=News=
==A tribute to our legacy==
We started a museum page to cover our [[legacy]]
==Internationale Open Hackerspace Dag 2025==
On Saturday, March 29, hackerspaces across the Netherlands are opening their doors to the public – and of course, Randomdata is joining in!

A hackerspace is a creative and technical playground where curious minds come together to build projects, share knowledge, and explore new ideas. During this national open day, you’ll get a chance to experience what hacking really means and see firsthand what’s possible in a hackerspace. Hint: the only real limit is your imagination.

Everyone is welcome!** Doors open at '''11:00 AM''', and the daytime program runs until '''5:00 PM'''. Some hackerspaces – including Randomdata – may remain open into the evening for extended activities. More information on [https://hackerspaces.nl/open-dag/]

===What to Expect===

Here’s a sneak peek at some of the activities:
* Socialize with the friends of Randomdata
* Learn how vulnerable systems can be, and how to secure them
* Get practical tips on protecting your privacy and personal data
* Try your hand at 3D printing** or soldering
* Explore Electronics, compute power or Raspberry Pi basics

Hackers place high value on ethics. At hackerspaces, people talk about how we can improve the world by looking critically – and creatively – at technology, society, and organizations, and by sharing knowledge freely. It’s also simply a fun, welcoming (s)p(l)ace.

More information on the [[Opendag2025]] page.

=The space location=
The space is located at the shared office space in Europalaan 2 also called "De Alchemist"

If the door isn't open, you can try calling the space telephone (+31 6 5130 2847) to ask if someone can open the door or use the dial panel.

There is free parking available at the space, but you have to ask us so we can tell you where :-)

=Contact information=
Here you can find our contact details, the higher up in this list the more frequently the communication channel is used by the community!

== Signal ==
There is a online community for Randomdata where we share announcement and make plans for future events, such as WHY2025!

To gain access to the community/channels.... come to the space

We used Whaaztzzzaaaaapp but because of privacy issues we moved to Signal

== Chat ==
We have our own chat server, in our signal channel you can get access to create a user.

==== Past ====
We used IRC in the past. There is a legacy Discord available for RandomData, you can join it trough the link [https://discord.com/invite/9dzUnxF here]

== Meetup ==
The [https://www.meetup.com/randomdata/?eventOrigin=event_home_page meetup] is mainly used to track events planned by the space, but for brevity its added here as well because its possible to reach us from there, but expect a delayed response compared to Discord/<s>WhatsApp</s>

== E-Mail ==
Please use info at for all inquiries.

"info '''at sign''' randomdata.nl"

== More ==
Also check our [[Agenda]] with activities 
LinkedIn: [http://www.linkedin.com/groups?gid=2587386] 
Flickr: [http://www.flickr.com/photos/randomdata] 
Random[[Friends]]

=Active pages:=
*[[:Category:Docs|Space Documentation]]
*[[Membership]]
*[[Projects]]
*[[Space]]
*[[Donations|Contributors, sponsors, people we love!]]
= THIS IS A OLD RESTORE FROM 2018! =
So Things could be dated on some pages, please be aware of that. Some Archived articles:

=Pasr active pages:=
*[[Agenda]]
*[[:Category:Docs|Space Documentation]]
*[[Membership]]
*[[Projects]]
*[[Space]]
*[[Workshops]]
*[http://www.flickr.com/photos/randomdata Pictures]
*[[Donations|Contributors, sponsors, people we love!]]

User:M10

2025-03-30T08:36:39Z

M10: init

yet another account

Spacebot

2025-03-30T08:35:11Z

M10: Grammar of featureless

The Spacebot is used to control space related automation tasks. 
__TOC__

=Redesign=
==Featurelist==
===Must===
*tell if the space is open
*have a manual override
*bring the status to hackerspaces.nl
===Should===
*work autonomous
*be maintained by more the one hax0r
===Could===
*be combined with "home automation" like stuff
*have lazersssss
===Won't===
*have privacy issues

=Oldspacebot=
[[File:cactispacesample.png|300px]]

==Goals==
Our goals for now
*Temperature monitor and (remote)control
*Space status (open, close) automation and interfacing to [https://twitter.com/#!/randomdataspace Twitter]

==Accomplished==
*Monitoring of light and temperature:
**[http://www.smurfer.net/cacti/graph_image.php?local_graph_id=58 graphs]
**[[Contact#Chatroom_.2F_IRC|IRC]] #randomdata !status
**Status.html also used for hackerspaces.nl and blogpage: [http://www.randomdata.nl/status.html status.html]
**Environment page: [http://www.randomdata.nl/spacestatus.html]
*Space status tweeter to [https://twitter.com/#!/randomdataspace @randomdataspace]

==How==
*Arduino: [http://arduino.cc/]
*Sensor shield: [http://www.nuelectronics.com/estore/index.php?main_page=product_info&cPath=7&products_id=20]
*DS18B20 Temperature sensor: [http://www.nuelectronics.com/estore/index.php?main_page=product_info&cPath=7&products_id=27]
*LDR (Light Dependant Resistor): [http://www.nuelectronics.com/estore/index.php?main_page=product_info&cPath=7&products_id=22]

The Arduino with the sensorshield and sensors is connected thru USB to a [[NSLU2]] (this could also be a regular pc). A cron job reads every minute the serial port of the [Arduino]. It will display the value's of the light sensor and the temperature sensor. Thru a http call to our server the cron job will post these value's to the Randomdata webserver.
The webserver will store the value's and add them to cacti, make some calculations if the light of the space is already on (or off) for 5 minutes and take some actions like twitter and adjust some html pages.

==To fix, adjust etc==
*Publish documented code of the Arduino
*Publish the scripts of the cron job
*Publish the scripts of the webserver
*Publish the IRC scripts
*create a more permanent casing for the Arduino
*add an electronic valve to the heating system
*activate the central heating valve
*add functionality to the system to put the temperature up and down (IRC "!temp up" & "!temp down" & "!temp up 17:00-23:00"
[[Category:Projects]]
[[Category:Arduino]]

==Code Arduino==
<pre>

#define TEMP_PIN 18
#define LDR_PIN 3

void OneWireReset(int Pin);
void OneWireOutByte(int Pin, byte d);
byte OneWireInByte(int Pin);
int lightcounter;

void setup()
{
digitalWrite(TEMP_PIN, LOW);
pinMode(TEMP_PIN, INPUT); // sets the digital pin as input (logic 1)
Serial.begin(9600);
delay(100);
}

void loop()
{
int HighByte, LowByte, TReading, SignBit, Tc_100, Whole, Fract;

OneWireReset(TEMP_PIN);
OneWireOutByte(TEMP_PIN, 0xcc);
OneWireOutByte(TEMP_PIN, 0x44); // perform temperature conversion, strong pullup for one sec

OneWireReset(TEMP_PIN);
OneWireOutByte(TEMP_PIN, 0xcc);
OneWireOutByte(TEMP_PIN, 0xbe);

LowByte = OneWireInByte(TEMP_PIN);
HighByte = OneWireInByte(TEMP_PIN);
TReading = (HighByte << 8) + LowByte;
SignBit = TReading & 0x8000; // test most sig bit
if (SignBit) // negative
{
TReading = (TReading ^ 0xffff) + 1; // 2's comp
}
Tc_100 = (6 * TReading) + TReading / 4; // multiply by (100 * 0.0625) or 6.25

Whole = Tc_100 / 100; // separate off the whole and fractional portions
Fract = Tc_100 % 100;

if (SignBit) // If its negative
{
Serial.print("-");
}
Serial.print("temp=");
Serial.print(Whole);
Serial.print(".");
if (Fract < 10)
{
Serial.print("0");
}
Serial.print(Fract);

int light;
light = analogRead(LDR_PIN);
Serial.print("&light=");
Serial.print(light);

//counter for twitter
if (light >= 300)
{
lightcounter = lightcounter + 1;
if (lightcounter > 120) lightcounter = 120;
}
else
{
lightcounter = lightcounter - 1;
if (lightcounter <= 1) lightcounter = 0;
}

Serial.print("&lc=");
Serial.print(lightcounter);
Serial.print("\n");

delay(5000); // 5 second delay. Adjust as necessary
}

void OneWireReset(int Pin) // reset. Should improve to act as a presence pulse
{
digitalWrite(Pin, LOW);
pinMode(Pin, OUTPUT); // bring low for 500 us
delayMicroseconds(500);
pinMode(Pin, INPUT);
delayMicroseconds(500);
}

void OneWireOutByte(int Pin, byte d) // output byte d (least sig bit first).
{
byte n;

for(n=8; n!=0; n--)
{
if ((d & 0x01) == 1) // test least sig bit
{
digitalWrite(Pin, LOW);
pinMode(Pin, OUTPUT);
delayMicroseconds(5);
pinMode(Pin, INPUT);
delayMicroseconds(60);
}
else
{
digitalWrite(Pin, LOW);
pinMode(Pin, OUTPUT);
delayMicroseconds(60);
pinMode(Pin, INPUT);
}

d=d>>1; // now the next bit is in the least sig bit position.
}

}

byte OneWireInByte(int Pin) // read byte, least sig byte first
{
byte d, n, b;

for (n=0; n<8; n++)
{
digitalWrite(Pin, LOW);
pinMode(Pin, OUTPUT);
delayMicroseconds(5);
pinMode(Pin, INPUT);
delayMicroseconds(5);
b = digitalRead(Pin);
delayMicroseconds(50);
d = (d >> 1) | (b<<7); // shift d to right and insert b in most sig bit position
}
return(d);
}
</pre>